API · Manage · Equity
Create a convertible.
Typed front door for issuing a SAFE or convertible note. Equivalent to POST /entities/{id}/share_ledger with kind: safe_grant | note_grant but validates per-instrument fields strictly. The polymorphic share_ledger endpoint remains available for power users; this is the discoverable, typed surface for LLM agents and SDKs.
SAFE types. Pre-money SAFEs (Y Combinator's original 2013 form) and post-money SAFEs (current YC standard, post-2018) yield materially different dilution math at conversion. Set safe.safe_kind precisely.
MFN. If mfn=true, the instrument is retroactively repriced when a later instrument has better terms. On Round.close, Matter walks all mfn=true instruments and reprices them before computing the conversion schedule.
Returns 202 Accepted. On completion, emits one of: grant.issued, share_class.created, valuation.created, share_ledger.entry_recorded. Subscribe via `POST /v1/webhook_endpoints` to consume.
Last updated
Request Body
application/json
TypeScript Definitions
Use the request body type in TypeScript.
authorizing_resolutionobjectOptionalWhether to auto-generate the underlying board resolution
that authorises this action. Defaults to auto: true.
The resolution and the action artifact share an
Idempotency-Key; both land atomically or neither does.
autobooleanOptionalrecitalsarray<string>OptionalOptional plain-English context to embed in the resolution's recitals[]. Useful when the board's consideration warrants a specific narrative.
kindstringRequiredOne of
"safe""note"investor_stakeholder_idstringRequiredprincipalobjectRequiredCurrency amount in the smallest unit (cents for USD).
amountintegerRequiredInteger in smallest unit. 100 = USD 1.00.
currencystringRequiredISO 4217 alpha-3, lower-cased.
issue_datestring<date>RequiredsafeobjectOptionalRequired when kind=safe.
safe_kindstringOptionalOne of
"pre_money_cap_only""pre_money_discount_only""pre_money_cap_and_discount""pre_money_mfn""post_money_cap_only""post_money_discount_only""post_money_cap_and_discount""post_money_mfn"valuation_capobjectOptionalCurrency amount in the smallest unit (cents for USD).
amountintegerRequiredInteger in smallest unit. 100 = USD 1.00.
currencystringRequiredISO 4217 alpha-3, lower-cased.
discount_ratenumberOptionalpro_rata_rightsbooleanOptionalmfnbooleanOptionalnoteobjectOptionalRequired when kind=note.
valuation_capobjectOptionalCurrency amount in the smallest unit (cents for USD).
amountintegerRequiredInteger in smallest unit. 100 = USD 1.00.
currencystringRequiredISO 4217 alpha-3, lower-cased.
discount_ratenumberOptionalinterest_ratenumberOptionalAnnual decimal (0.06 = 6%).
compoundingstringOptionalOne of
"simple""monthly""quarterly""annually"maturity_datestring<date>Optionalqualified_financing_thresholdobjectOptionalCurrency amount in the smallest unit (cents for USD).
amountintegerRequiredInteger in smallest unit. 100 = USD 1.00.
currencystringRequiredISO 4217 alpha-3, lower-cased.
mfnbooleanOptionalmetadataobjectOptionalFlat string-to-string map. Up to 50 keys. Keys: max 40 chars, charset
[A-Za-z0-9_\\-.]. Values: max 500 chars. Keys prefixed matter_ are reserved
for platform use. Metadata is retrievable but not filterable via query params.
Response Body
application/json
application/problem+json
application/problem+json
application/problem+json
application/problem+json
application/problem+json
Request
curl -X POST "https://api.mattermode.com/v1/entities/{id}/convertibles" \ -H "Content-Type: application/json" \ -d '{ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {} }'const body = JSON.stringify({ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {}})fetch("https://api.mattermode.com/v1/entities/{id}/convertibles", { method: "POST", headers: { "Content-Type": "application/json" }, body})package mainimport ( "fmt" "net/http" "io/ioutil" "strings")func main() { url := "https://api.mattermode.com/v1/entities/{id}/convertibles" body := strings.NewReader(`{ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {} }`) req, _ := http.NewRequest("POST", url, body) req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := ioutil.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body))}import requestsheaders = { "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc", "Matter-Version": "2026-06-10", "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",}payload = { "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {}}resp = requests.post( "https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/convertibles", headers=headers, json=payload,)resp.raise_for_status()print(resp.json())import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;import java.net.http.HttpRequest.BodyPublishers;var body = BodyPublishers.ofString("""{ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {}}""");HttpClient client = HttpClient.newBuilder() .connectTimeout(Duration.ofSeconds(10)) .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder() .uri(URI.create("https://api.mattermode.com/v1/entities/{id}/convertibles")) .header("Content-Type", "application/json") .POST(body) .build();try { HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString()); System.out.println("Status code: " + response.statusCode()); System.out.println("Response body: " + response.body());} catch (Exception e) { e.printStackTrace();}using System;using System.Net.Http;using System.Text;var body = new StringContent("""{ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {}}""", Encoding.UTF8, "application/json");var client = new HttpClient();var response = await client.PostAsync("https://api.mattermode.com/v1/entities/{id}/convertibles", body);var responseBody = await response.Content.ReadAsStringAsync();curl --request POST 'https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/convertibles' \ --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \ --header 'Matter-Version: 2026-06-10' \ --header 'Idempotency-Key: ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b' \ --header 'Content-Type: application/json' \ --data '{ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {}}'const response = await fetch("https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/convertibles", { method: "POST", headers: { "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc", "Matter-Version": "2026-06-10", "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b", "Content-Type": "application/json", }, body: JSON.stringify({ "kind": "safe", "investor_stakeholder_id": "string", "principal": { "amount": 50000, "currency": "usd" }, "issue_date": "2026-04-25", "safe": { "safe_kind": "pre_money_cap_only", "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "pro_rata_rights": false, "mfn": false }, "note": { "valuation_cap": { "amount": 50000, "currency": "usd" }, "discount_rate": 0, "interest_rate": 0, "compounding": "simple", "maturity_date": "2026-04-25", "qualified_financing_threshold": { "amount": 50000, "currency": "usd" }, "mfn": false }, "metadata": {} }),});if (!response.ok) { throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);Response
application/json{
"resource": {
"object": "convertible",
"kind": "safe",
"status": "outstanding",
"grant_entry": {
"id": "string",
"object": "share_ledger_entry",
"entity_id": "ent_Nq3KcAbc",
"kind": "issuance",
"transaction_date": "2026-04-25",
"created": 0,
"updated": 0,
"livemode": false
}
},
"intent": {
"id": "string",
"object": "intent",
"goal": "form_startup_ready_corporation",
"parameters": {},
"status": "draft",
"created": 1745539200,
"updated": 1745539200,
"livemode": false
},
"execution_plan": {
"steps": [
{
"operation": "string",
"status": "pending"
}
]
},
"authorization": {
"id": "string",
"object": "authorization",
"token_id": "tok_4Kj2m8pQ",
"action": "string",
"payload_hash": "string",
"status": "pending",
"expires_at": 1745539200,
"created": 1745539200,
"updated": 1745539200,
"livemode": false
},
"pending_filings": [
{
"id": "string",
"object": "filing",
"entity_id": "ent_Nq3KcAbc",
"type": "certificate_of_amendment",
"jurisdiction": "US-DE",
"status": "preparing",
"created": 1745539200,
"updated": 1745539200,
"livemode": false
}
],
"cascaded_documents": [
{
"id": "string",
"object": "document",
"entity_id": "ent_Nq3KcAbc",
"type": "certificate_of_incorporation",
"status": "draft",
"sha256": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
"version": 1,
"created": 1745539200,
"updated": 1745539200,
"livemode": false
}
],
"cascaded_resolutions": [
{
"id": "string",
"object": "resolution",
"entity_id": "ent_Nq3KcAbc",
"kind": "board_meeting",
"subject": "Approval of 2026 Equity Plan and initial pool of 2,000,000 shares",
"created": 1745539200,
"updated": 1745539200,
"livemode": false
}
],
"events_emitted": [
"string"
],
"applied_defaults": [
"string"
],
"next_steps": [
{
"endpoint": "POST /v1/entities/ent_Nq3KcAbc/tax_elections",
"reason": "Founder restricted-stock issuances require 83(b) within 30 days."
}
]
}{
"type": "https://mattermode.com/docs/errors/invalid_request",
"title": "Invalid request",
"status": 400,
"code": "invalid_request",
"detail": "Request body could not be parsed as JSON.",
"doc_url": "https://mattermode.com/docs/guides/errors#invalid_request",
"request_id": "req_Qw9xYz8A"
}{
"type": "https://mattermode.com/docs/errors/authentication_required",
"title": "Authentication required",
"status": 401,
"code": "authentication_required",
"detail": "No bearer token was supplied. Pass `Authorization: Bearer sk_live_...` on every request.",
"doc_url": "https://mattermode.com/docs/guides/errors#authentication_required",
"request_id": "req_Qw9xYz8A"
}{
"title": "Invalid state transition",
"status": 409,
"detail": "Entity ent_Nq3KcAbc is in state `dissolved` and cannot be dissolved again.",
"instance": "/requests/req_Qw9xYz8A",
"code": "invalid_state_transition",
"param": "founders[0].equity",
"doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
"request_id": "req_Qw9xYz8A",
"retry_after": 30,
"authorized_by": {
"human_principal_id": "usr_4Kj2m8pQ",
"agent_id": "agt_Nq3KcAbc"
},
"type": "https://errors.mattermode.com/terms_acceptance_required",
"terms_version": "string",
"terms_summary": "string",
"terms_url": "http://example.com"
}{
"type": "https://mattermode.com/docs/errors/validation_failed",
"title": "Validation failed",
"status": 422,
"code": "validation_failed",
"detail": "One or more fields failed validation. See `errors[]`.",
"doc_url": "https://mattermode.com/docs/guides/errors#validation_failed",
"request_id": "req_Qw9xYz8A",
"errors": [
{
"field": "founders[0].equity",
"code": "out_of_range",
"message": "Equity must sum to 100% across all founders."
}
]
}{
"type": "https://mattermode.com/docs/errors/rate_limit_exceeded",
"title": "Rate limit exceeded",
"status": 429,
"code": "rate_limit_exceeded",
"detail": "Request rate exceeded for this key. Retry after `retry_after` seconds or honor the `Retry-After` header.",
"doc_url": "https://mattermode.com/docs/guides/errors#rate_limit_exceeded",
"request_id": "req_Qw9xYz8A",
"retry_after": 30
}